Dolphin Biology
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Dolphin Biology |
Dolphins can be identified by the shape and pattern of notches and nicks on their dorsal fin. By classifying the fin based on location of distinguishing marks, individual dolphins can be cataloged. When a dolphin is sighted its picture can then be compared to the catalog of dolphins in the area and if a match is found, the dolphin can be recorded as resighted. This method of mark-resight allows for databases to be developed regarding the life history of individual dolphins. Levels of association between dolphins, population estimates, and general life history parameters such as birth and survival rates can then be calculated from these databases.
This dolphin would be found in the "lead" category of our catalog
due to the large notch on the leading edge of the fin.
Photo by Genevieve Haviland
Jason Allen and Rebecca Goodnight matchdolphin fin slides with animals in the catalog. Photo by Samantha Eide Jessica Odell and Meghan Pitchford search through catalog.
| Frequently resighted individuals (as of Jan 2000) | |
| Hammer
(adult female) |
59 |
| Mid
Button
Flag
(adult female) |
41 |
| Luseal
(adult female) |
31 |
| 84
Lookalike
(adult female) |
20 |
Hammer
July 2, 1999
Photo by Jonathan
Birnbaum
Population Estimates: (Based upon the Jolly-Seber Population Model)
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Last modified 6/28/00
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